जीव विज्ञान – Biology MCQ
जीव विज्ञान – कृषि/वन प्रवेश
Biology · Agriculture, Veterinary & Forestry Entrance · ८४० प्रश्न
८४० प्रश्न उपलब्ध। मोड छान्नुहोस्:
जीव विज्ञान: प्रश्न र उत्तर
सही लागेको विकल्पमा थिच्नुहोस्। सही भए हरियो, गलत भए रातो देखिन्छ; ३ सेकेन्डपछि सही उत्तर र व्याख्या देखिन्छ।
सही: ० / ०
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The 70S ribosome of a bacterial cell is made up of which two subunits?
सही उत्तर: ख) 50S and 30S
The prokaryotic 70S ribosome consists of a large 50S and a small 30S subunit; Svedberg units are not additive.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Movement of glucose into a cell down its concentration gradient with the help of a carrier protein, without the use of ATP, is called:
सही उत्तर: क) Facilitated diffusion
Facilitated diffusion uses membrane carrier or channel proteins but moves substances only down their concentration gradient, so no ATP is required.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The hybridoma technique for producing monoclonal antibodies, by fusing antibody-producing B cells with myeloma cells, was developed by:
सही उत्तर: ग) Köhler and Milstein
Georges Köhler and César Milstein developed hybridoma technology in 1975, for which they shared a Nobel Prize.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Lysosomes were discovered by:
सही उत्तर: ख) Christian de Duve
Christian de Duve discovered lysosomes in the 1950s by cell fractionation; Golgi described the Golgi apparatus and Brown the nucleus.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The uptake of fluid droplets by a cell through small invaginations of the plasma membrane ('cell drinking') is called:
सही उत्तर: ग) Pinocytosis
Pinocytosis is a form of endocytosis in which the cell takes in liquid and dissolved solutes in small vesicles; phagocytosis is the engulfing of solid particles.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Southern blotting is a technique used to detect specific:
सही उत्तर: ग) DNA sequences
Southern blotting (devised by Edwin Southern) transfers DNA fragments from a gel to a membrane and detects them with labelled probes; Northern blotting detects RNA.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Leucoplasts that store starch, as in potato tubers, are called:
सही उत्तर: घ) Amyloplasts
Amyloplasts are colourless plastids (leucoplasts) that store starch; elaioplasts store oils and aleuroplasts store proteins.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The pyramid of numbers in an ecosystem based on a single large tree supporting many insects is:
सही उत्तर: ग) Inverted
One tree (producer) supports many herbivorous insects, so the base is narrower than the next level, giving an inverted pyramid.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The term 'ecosystem' was first used in 1935 by:
सही उत्तर: घ) A.G. Tansley
Sir Arthur Tansley coined the term ecosystem in 1935.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The spread of cancerous cells from the primary tumour to distant parts of the body is called:
सही उत्तर: क) Metastasis
Malignant tumour cells reach distant sites through blood or lymph and form secondary tumours (metastasis).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
यी अभ्यास प्रश्न हुन्, आधिकारिक प्रश्न होइनन्। पाठ्यक्रम, विज्ञापन र नतिजाका लागि सम्बन्धित निकायको आधिकारिक वेबसाइट हेर्नुहोस्। उत्तरमा गल्ती भेटे प्रश्नमुनिको "टिप्पणी / गल्ती रिपोर्ट" मा लेख्नुहोस्।
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